Got a load of money burning a hole in your pocket? Are you a classic-rock rarities collector? Well, then listen up.

The Amherst, N.H.–based RR Auctions is putting together some of the rarest demo tapes of classic-rock milestones up for auction in a while, such as Led Zeppelin’s 1975 double-album Physical Graffiti, Bad Company‘s 1974 self-titled debut, four songs from Eric Clapton‘s 1973 album Eric Clapton’s Rainbow Concert, as well as recordings by the Who, Ozzy Osbourne and more.

Individually or as a collection, they’re sure to be auctioned for a huge sum.

According to Rolling Stone, many of the songs on the Physical Graffiti tapes “differ structurally from the ones that came out officially. The group re-recorded the guitar and vocal parts on many of the tapes’ songs, some of which lack vocals altogether, and, in some cases, it used only John Bonham’s drums tracks and completely redid the tracks.”

The website states: “Made in Ronnie Lane’s trailer-turned-studio at Headley Grange, these tracks represent some of the earliest ever Physical Graffiti recordings—these unmastered examples served as starting points for the final songs, with bits and pieces retained while other parts were re-recorded.”

One notable item from the collection being auctioned is an early, instrumental version of “Kashmir” under its demo title “Driving to Kashmir.” In other words, buy this at auction for the Led Zeppelin super fan in your life and watch him or her explode with joy.

It’s all part of RR Auctions’ Ron Nevison Collection as part of the Marvels of Modern Music. Other items up for bid: a signed U.K. first pressing of the Beatles’ Twist and Shout EP, the registration for John Lennon’s 1965 Rolls Royce, a pair of Lennon’s glasses that belonged to classical musician Victor Borge and the cape Elvis Presley wore in the 1973 TV special Aloha From Hawaii.

The auction begins on March 13, ending on March 20. Get that credit card ready and visit www.rrauction.com for information.